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Summary: Extract the functionality of eliminating unreachable basic blocks within a function, previously encapsulated within the -unreachableblockelim pass, and make it available as a function within BlockUtils.h. No functional change intended other than making the logic reusable. Exposing this logic makes it easier to implement https://reviews.llvm.org/D59068, which fixes coroutines bug https://bugs.llvm.org/show_bug.cgi?id=40979. Reviewers: mkazantsev, wmi, davidxl, silvas, davide Reviewed By: davide Subscribers: llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D59069 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@355846 91177308-0d34-0410-b5e6-96231b3b80d8